- 應用沙盒
- 歸檔
- 偏好設置
- Plist
應用沙盒
Documents
Library -- Caches
-- Preferences
tmp
歸檔
Person.h
#import <Foundation/Foundation.h>
@interface Person : NSObject <NSCoding>
/** 姓名 */
@property(nonatomic,copy) NSString* name;
/** 昵稱 */
@property(nonatomic,copy) NSString* nickName;
@end
Person.m
#import "Person.h"
@implementation Person
// 歸檔：只要一個自定義對象歸檔的時候就會調用,告訴系統(tǒng) 哪些屬性需要歸檔
- (void)encodeWithCoder:(NSCoder *)coder
{
[coder encodeObject:_name forKey:@"name"]; // 給屬性設置一個key
[coder encodeObject:_nickName forKey:@"nickName"];
}
//解檔：只要一個自定義對象解檔的時候就會調用,告訴系統(tǒng) 解析key得到的值，賦值給哪個屬性
- (id)initWithCoder:(NSCoder *)aDecoder{
// 什么時候調用 [super initWithCoder]
if (self = [super init]) {
_name = [aDecoder decodeObjectForKey:@"name"];
_nickName = [aDecoder decodeObjectForKey:@"nickName"];
}
return self;
}
@end
ViewController.m
#import "ViewController.h"
#import "Person.h"
//---------------思路----------------
//1、創(chuàng)建自定義對象
// 重寫encodeWithCoder 歸檔
// initWithCoder方法 解檔
//2、創(chuàng)建路徑 /caches
//3、使用歸檔類方法進行存儲
// 使用解檔類方法進行解檔
//-----------------------------------
@interface ViewController ()
- (IBAction)save:(id)sender;
- (IBAction)read:(id)sender;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (IBAction)save:(id)sender {
// 1、創(chuàng)建對象
Person *p = [[Person alloc] init];
p.name = @"李明";
p.nickName = @"hahaha";
// 2.1、創(chuàng)建路徑/tmp，使用函數
NSString *cachesPath = NSTemporaryDirectory();
// 2.2、拼接路徑;擴展名隨意寫，蘋果對內容進行了加密
NSString *path = [cachesPath stringByAppendingString:@"person.data"];
// 3、使用歸檔類方法進行存儲
[NSKeyedArchiver archiveRootObject:p toFile:path];
}
- (IBAction)read:(id)sender {
NSString *cachesPath = NSTemporaryDirectory();
NSString *path = [cachesPath stringByAppendingString:@"person.data"];
Person *p = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
NSLog(@"%@,%@",p.name,p.nickName);
}
@end
歸檔：什么時候調用super initWithCoder
#import "MyView.h"
@implementation MyView
// 解析文件的時候調用
// 作用:解析xib,storyboard調用
// 可以猜測 我們平時在storyboard中拖動的控件，是通過歸檔存儲的，當創(chuàng)建的時候就解析 歸檔文件 然后實例化
- (id)initWithCoder:(NSCoder *)aDecoder{
// 這里必須調用[super initWithCoder:aDecoder],super ->UIView
// 什么時候調用[super initWithCoder:aDecoder],只要父類遵守了NSCoding協(xié)議,就調用[super initWithCoder:aDecoder]
if(self = [super initWithCoder:aDecoder])
{
NSLog(@"調用了initWithCoder");
}
return self;
}
@end
偏好設置
#import "ViewController.h"
@interface ViewController ()
- (IBAction)save:(id)sender;
- (IBAction)read:(id)sender;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (IBAction)save:(id)sender {
// /Library/Preferences
// 獲取單例對象
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setValue:@"YChiong" forKey:@"name"];
[userDefaults setObject:@"xmg" forKey:@"address"];
[userDefaults setBool:YES forKey:@"isHandSome"];
[userDefaults setInteger:25 forKey:@"age"];
}
- (IBAction)read:(id)sender {
// 獲取單例對象
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSString *name = [userDefaults valueForKey:@"name"];
NSString *address = [userDefaults objectForKey:@"address"];
BOOL isHandSome = [userDefaults boolForKey:@"isHandSome"];
NSInteger age = [userDefaults integerForKey:@"age"];
NSLog(@"%@,%@,%i,%i",name,address,isHandSome,age);
}
@end
Plist
#import "ViewController.h"
@interface ViewController ()
- (IBAction)save:(id)sender;
- (IBAction)read:(id)sender;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
- (IBAction)save:(id)sender {
// 1、創(chuàng)建數組或者字典
NSArray *arr = @[@"YChiong",@25];
// 2、創(chuàng)建存儲路徑
// 2.1 /Library/Caches文件夾
// 參數：
// NSSearchPathDirectory directory：獲取哪個文件夾
// NSSearchPathDomainMask domainMask：在哪個范圍下獲取 NSUserDomainMask:在用戶的范圍內搜索?
// BOOL expandTilde：expandTilde是否展開全路徑,YES:展開
// 返回值：一個數組
NSString *cachePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
// 2.2 拼接路徑
NSString *plistPath = [cachePath stringByAppendingPathComponent:@"YChiong.plist"];
// 3、存儲數組/字典 到 指定路徑
[arr writeToFile:plistPath atomically:YES];
}
- (IBAction)read:(id)sender {
// 怎么存，就怎么取
NSString *cachePath = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
NSString *plistPath = [cachePath stringByAppendingPathComponent:@"YChiong.plist"];
NSArray *arr = [NSArray arrayWithContentsOfFile:plistPath];
NSLog(@"%@",arr);
}
@end
